Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
  • F25B43/003—Filters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
  • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
  • B01D24/04—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being clamped between pervious fixed walls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D27/00—Cartridge filters of the throw-away type
  • B01D27/02—Cartridge filters of the throw-away type with cartridges made from a mass of loose granular or fibrous material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating devices
  • B60H1/32—Cooling devices
  • B60H1/3204—Cooling devices using compression
  • B60H1/3227—Cooling devices using compression characterised by the arrangement or the type of heat exchanger, e.g. condenser, evaporator
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating devices
  • B60H1/32—Cooling devices
  • B60H1/3204—Cooling devices using compression
  • B60H1/3229—Cooling devices using compression characterised by constructional features, e.g. housings, mountings, conversion systems

Definitions

• the present invention relates to filtration devices for a refrigerant circuit of the type comprising a hollow body provided on one side with a bottom and having, on the other side, an opening closed by a sealing piece, said sealing piece having a fluid outlet.
• It also relates to a method of manufacturing a device of this type.
• Such devices contain a filter group capable of retaining impurities and the water contained in the refrigerant.
• the filter unit is of annular shape, crossed by a plunger tube of reduced diameter in communication with the outlet orifice downstream of the filter group.
• This reservoir must also be introduced into the hollow body, around the tubing of reduced diameter, which poses manufacturing problems.
• Known devices are also generally made up of steel or aluminum parts, welded together using the TIG technique, which risks damaging the temperature-sensitive filter group material during manufacture.
• the present invention aims to provide a device that better meets those previously known to the requirements of practice, in particular in that it allows a manufacture which does not risk damaging the filter material, simple to use, using fewer parts than in the prior art, and using materials such as aluminum alloys, which are significantly lighter.
• the invention proposes in particular a filtration device for a refrigerant circuit comprising a hollow body provided on one side with a bottom and having on the other side an opening closed by a closure piece, said piece obturation comprising a fluid outlet orifice, characterized in that the outlet orifice is directly in communication with the space located near the bottom of the body, by means of a tube containing a filter screen, the hollow body being fixed by gluing and crimped on the periphery of said part.
• the tube is of cylindrical cross-section in line with the filter screen, of dimension ranging between approximately one third and of the order of nine tenths of the internal section of the hollow body;
• the hollow body is a first half-shell provided with a cylindrical wall and the closure part is a second half-shell formed in one piece by a bottom and a cylindrical wall introduced frictionally into the first half-shell to which it is fixed by gluing, the first half-shell being crimped on the periphery of the bottom of the second half-shell;
• the device further comprises at least one O-ring in sealing elastomer between the hollow body and the closure part;
• the outlet is in communication with an internal channel in which is disposed a visual indicator of the humidity level of the refrigerant or an indicator of the filling of the circuit;
• the closure part comprises the inlet port for the refrigerant, which communicates with the annular space delimited on the one hand by the internal wall of the hollow body, or of the second half-shell if necessary , and on the other hand by the external wall of the tubing;
• the hollow body and the closure piece are made of aluminum alloy
• the tubing is made of plastic
• the device comprises spring means for compressing the filter screen between the bottom of the hollow body and a stop internal to said tube.
• the invention also provides a method of manufacturing a device as described above and in particular a method of manufacturing a device for filtering a coolant from a hollow body provided on one side with a bottom and having on the other side an opening arranged to be closed by a piece of obturation, said obturation part comprising a fluid outlet orifice, characterized in that one fixes to the obturation part and in the extension of the outlet orifice, a tube containing a filter screen, the length of said tubing being such that the end of said tubing is located near the bottom of the body when the closure piece is fixed to the hollow body, means of compression of the filter screen are put in place, and it is fixed by gluing and by crimping said hollow body containing said tubing on the periphery of said part.
• the hollow body being a first deifli-shell provided with a cylindrical wall and the closure piece a second half-shell formed in one piece by a bottom and a cylindrical wall is coated at least in part with polymerizable adhesive the internal or external surface of at least one of the two half-shells, the so-called internal half-shell is introduced into the other so-called external half-shell, with which it cooperates in friction or substantially in friction, until it comes substantially in abutment against the bottom of said external half-shell, and the end of the external half-shell is crimped onto the bottom of the internal half-shell.
• FIG. 1 is a side view partly in axial section, of a first embodiment of a device according to the invention.
• FIG. 1 is a sectional view along II-II of Figure 1.
• FIG. 3 is a sectional view along III-III of the closure part of Figure 1.
• FIG. 4 is a top view of the device of Figure 1.
• FIG. 5 is a side view, in section, of a second embodiment of a device according to the invention.
• Figure 1 shows a device 1 according to a first embodiment of the invention.
• the device 1 comprises a hollow body 2 made of aluminum alloy, formed of a cylindrical wall 3 for example 1 to 3 mm thick, provided on one side with a bottom 4 formed in one piece with the wall 3 for example by impact spinning.
• the hollow body has on the other side an opening 5 closed by a closure piece 6, also made of aluminum alloy, of substantially cylindrical shape at the closure and comprising an upper connection portion 7 with pipes of 'inlet and outlet of the refrigerant.
• the liquid is for example a refrigerant of the type known under the references HFA134A or CFC12.
• the part 6 comprises a fluid outlet orifice 8, arranged to be connected at a right angle at 9, via a channel having a right angle elbow 10 (see FIG. 2), in a sealed manner and known in it - even, with an outlet pipe (not shown).
• the part 6 also comprises an orifice 11 for entering the liquid into the hollow body, arranged to be connected at a right angle at 12, in an identical manner to the outlet pipe, to an inlet pipe (not shown).
• the outlet orifice 8 is moreover connected, on the side of the hollow body, to a tube 13 containing the filtering screen 14.
• the end 15 of the tubing, opposite the part 6, is in turn directly connected to the space 16 located near the bottom 4 of the hollow body.
• the tubing is for example made of plastic, for example polyamide known under the name 6-6, loaded to the order of 30% by weight of glass fibers. It has a funnel part 17 which makes the connection with the orifice 8.
• Part 17 is connected to a main portion 18 of the tubing, having a constant cylindrical cross section up to its end 15, and including in particular the filter screen.
• the dimension of the external diameter of this tubing is for example between a third and of the order of 9/10 of the internal diameter of the hollow body.
• the filter screen 14 comprises a molecular screen, for example constituted, in a manner known per se, by a layer of alumino-silicate beads, sandwiched between an upper grid formed, from top to bottom, by a plate with holes of material identical to the tubing, a brass screen and a felt sheet of 1 to 3 mm thick, and a lower grid 26 formed identically, but in reverse order, to the upper grid.
• a molecular screen for example constituted, in a manner known per se, by a layer of alumino-silicate beads, sandwiched between an upper grid formed, from top to bottom, by a plate with holes of material identical to the tubing, a brass screen and a felt sheet of 1 to 3 mm thick, and a lower grid 26 formed identically, but in reverse order, to the upper grid.
• the grid 19 abuts upwards against a cylindrical shoulder 19 " machined on the internal wall 21 of the pipe 13.
• the grid 20 is in turn compressed, for example, by a coil spring 22 bearing on the bottom 4 on one side and on the bottom wall 23 of the grid 20 on the other side.
• the tubing 13 is fixed to the inlet of the orifice 8, on the bottom wall of the closure piece 6, for example by bonding with an adhesive of the type known under the name "Loctite” or equivalent, or / and by deformation of the part 6 for example along 3 points.
• the inlet 10 is itself in direct communication with 1 • annular space delimited by the internal wall of the hollow body and by the external wall of the tubing.
• the closure piece 6 comprises an annular peripheral flange 24, which separates the closure portion proper, inserted in the opening 5 of the hollow body, from the upper portion 7 for connection with the inlet and outlet pipes of the refrigerant.
• the peripheral flange 24 abuts against the upper edge of said opening.
• an O-ring seal 25 is provided, for example made of elastomeric material of the type known under the name VITON. These seals are threaded onto the end of the closure piece situated on the side of the hollow body with respect to the protrusion 24, and are placed in abutment on either side of an annular shoulder 26 in protrusion with respect to said part part.
• the closure piece 6 is moreover fixed to the end of the hollow body by one or more beads of glue, for example of the type known under the name K ⁇ M ERLING, under the reference CORAPOX 562L2, or by means of a thin film of said glue distributed over the internal face of the periphery of the end of the hollow body or of the external face of the opposite piece.
• beads of glue for example of the type known under the name K ⁇ M ERLING, under the reference CORAPOX 562L2
• a thin film of said glue distributed over the internal face of the periphery of the end of the hollow body or of the external face of the opposite piece.
• the end of the hollow body is then crimped onto the periphery of said part inserted into the opening, the lateral projection 24 abutting on the hollow body.
• a cylindrical ring 27 for external crimping is for example provided. It is inserted between the flange 24 and a lateral projection 25 of the end of the hollow body, due to the deformation of said end during crimping on the shoulder 26.
• the filtration / dehydration of the refrigerant is carried out as follows.
• the fluid enters the device through the orifice 12 of the closure piece 6 and enters the annular space external to the tubing (arrow 28).
• an indicator 29 is provided for the humidity level of the refrigerating fluid at the outlet, making it possible to assess the saturation of the molecular sieve, and / or a filling indicator.
• This indicator is located downstream of the filtering screen, for example (see FIG. 3) at the right of the internal channel 30 of the orifice 8 before the perpendicular bend 31 for lateral outlet of the fluid at 9. This indicator is then incorporated in the part d shutter 6.
• a transparent element 32 for example made of cast glass.
• the element 33 constituting the indicator is placed and fixed below. It is arranged to change color depending on the humidity level of the refrigerant and has for example the shape of a ring whose color is therefore visible through the element 32.
• This indicator is arranged in a manner known per se to hold to the operating pressure of the device (of the order of 27 bars).
• Figure 4 there is shown the top view of the device of Figure 1, to show the appearance of the indicator 29, visually accessible from above, which has advantages for a user who can thus easily verify the correct operation of the filtration device.
• FIG. 5 shows another embodiment of the device 35 or bottle according to the invention.
• the device 35 has a shutter piece 36 whose orifices 37 and 37 ′ of inlet and outlet of the coolant are arranged to allow connections in the extension of the hollow body, and not perpendicularly.
• the part 36 is formed by a half-shell provided with a cylindrical wall 36 'formed in one piece with the bottom which has a cylindrical upper part 36' 'recessed.
• the wall is introduced by friction into the hollow body provided in the upper part with a part 38 of larger diameter than the rest of the body, to which it is fixed by gluing, the hollow body then being crimped on the recessed part 36 ' '.
• the device 35 also differs essentially from the mode described with reference to FIG. 1 only by the length of the hollow body, which is greater, and by the shape of the piece 36 glued / crimped onto the hollow body, as has just been to see him.
• an extension piece 39 essentially cylindrical, which abuts against the lower grid 40 of the filter screen.
• the part has a recessed cylindrical lower part 41, around which the spring 42 is threaded, abutting up against a shoulder 43 of said recess, and abutting down on the bottom.
• the refrigerant inlet orifice may be lateral at the top of the bottle or even located on the bottom of said bottle (connections shown at 44 and 45 in broken lines in FIG. 5).
• One such method consists in manufacturing separately and beforehand, the tubing containing the filter screen.
• tubing is fixed in a simple manner by gluing or crimping on the closure part.
• the tubing is then fitted with the pressurizing spring 22.
• the lower outer periphery of the closure piece is coated with one or more beads of glue, any O-rings having been previously threaded onto said lower periphery.
• the part is then put in place and fixed by gluing and crimping on the hollow body.
• the invention is not limited to the embodiments described but on the contrary embraces all variants and in particular those where the inlet is on the side of the body, or on the bottom of the body, those where the material used for the body, as for the internal tubing, is a plastic material such as polyamide reinforced with fiberglass; the crimping is carried out by spinning or by magnetoforming.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Power Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Separation Using Semi-Permeable Membranes (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=9449362

Family Applications (1)

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• 1993
  • 1993-07-19 FR FR9308834A patent/FR2707891B1/fr not_active Expired - Fee Related
• 1994
  • 1994-07-19 DE DE69413825T patent/DE69413825T2/de not_active Expired - Fee Related
  • 1994-07-19 EP EP94922276A patent/EP0710145B1/de not_active Expired - Lifetime
  • 1994-07-19 WO PCT/FR1994/000902 patent/WO1995003110A1/fr not_active Ceased

Non-Patent Citations (1)

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